eatathon in English dictionary eatathon Meanings and definitions of "eatathon" A charity event in which participants eat as much as possible. (slang) A large feast or pigout. noun A charity event in which participants eat as much as possible. noun (slang) A large feast or pigout. more Grammar and declension of eatathon eatathon ( plural not attested) eatathon (plural not attested) more Sample sentences with "eatathon" Declension Stem Try again Authors